The most probable is that the girl has amnesia because she got hit in the back in the head with a bat once and this was his old bf trying to reconcile with the "new" her.endings:
- he gets kidnapped, she dies rescuing him (or gets face smashed in and he breaks up with her because of that)
- she beats him up
- accident kills one of them
- it was all a dream
- it's a plan to get to her and beat her up by rival gang
he still trusts Hamita